CN1289188A - Non-contact type IC card preventing data from error restoring while AM wave-carrier demodulation - Google Patents
Non-contact type IC card preventing data from error restoring while AM wave-carrier demodulation Download PDFInfo
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- CN1289188A CN1289188A CN00130436.4A CN00130436A CN1289188A CN 1289188 A CN1289188 A CN 1289188A CN 00130436 A CN00130436 A CN 00130436A CN 1289188 A CN1289188 A CN 1289188A
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- 238000001514 detection method Methods 0.000 claims abstract description 3
- 239000003990 capacitor Substances 0.000 claims description 18
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 230000005906 menstruation Effects 0.000 claims description 4
- 230000000979 retarding effect Effects 0.000 claims 4
- 230000001934 delay Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 17
- 230000000630 rising effect Effects 0.000 description 5
- 238000007634 remodeling Methods 0.000 description 4
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
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- Near-Field Transmission Systems (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Credit Cards Or The Like (AREA)
Abstract
In a contactless IC card that performs envelope detection on an ASK-modulated carrier wave and demodulates the carrier wave to recover data piggybacked thereon, demodulation is suspended during periods where there is no possibility of a change of a data value (from data 0 to data 1, or from data 1 to data 0) in the digital data piggybacked on the carrier wave. In so doing, incorrect data recovery can be prevented even when noise arises in power supply voltage waveform due to power consumption of an internal memory or the like.
Description
The application is the application of H11-268632 based on the application number of submitting in Japan, here the content of this application is included, for your guidance.
The present invention relates to a kind of non-contact IC (integrated circuit) card, for receiving with the carrier wave of the index of modulation less than 100% amplitude modulation, and the carrier wave of separating menstruation regulating amplitude modulation specifically the present invention relates to a kind of data that prevent and is separating the technology that the timing mistake is recovered with institute's data carried by data on the reinsertion of carrier.
In recent years, resemble and consider to adopt the contactless IC card system that is made of IC-card and read write line (hereinafter to be referred as " R/W ") in the system of train ticket gathering system, security system and electronic cash system and so on day by day, wherein the carrier wave of R/W by fixed frequency carries out non-contact data with IC-card and communicates by letter.The general structure of this class contactless IC card system of following brief description.
Fig. 1 shows the general structure of contactless IC card system.As shown in FIG., contactless IC card system roughly is made of a non-contact IC card 10 and a R/W 30, non-contact IC card is equipped with an IC 11 and a loop coil 12, and 30 of R/W are equipped with a loop coil 21, modulating/demodulating part 22, a control section 23 and an I/O part 24.
R/W 30 is contained in the train ticket and receives among the ticket sluice gate, with data waiting for transmission the carrier wave of preset frequency (for example 13.56 megahertzes) is carried out amplitude modulation (ASK (amplitude is compiled and moved keying) modulation), and send the carrier wave of amplitude modulation to non-contact IC card 10 as season ticket etc.Like this, for data are sent to non-contact IC card 10 and adopt the ASK modulation from R/W 30, determine numerical data 0 and 1 according to the rank of carrier amplitude.Here, the index of modulation of ASK modulation never reaches 100%.Adopt the index of modulation data are transmitted under the narrow situation of the bandwidth that takies at a high speed, thereby make non-contact IC card obtain the correct signal of modulating less than 100% ASK modulation.
As seen from the above description, the data processing in the non-contact IC card 10 is mainly undertaken by IC 11.The following describes the structure of IC 11.
Fig. 2 is the block diagram of IC 11 structures.Non-contact IC card 10 is not owing to there is battery, thereby carries out rectification by the carrier wave that R/W 30 is sent and obtain direct current.
IC 11 comprises a rectifier 40, modulating/demodulating part 41, control section 42, a storage area 43 and a voltage stabilizing circuit 44.Rectifier 40 connect as antenna give/from the loop coil 12 of R/W 30 transmission/reception carriers.Modulating/demodulating part 41 connects rectifier 40.Among the figure, rectifier 40 and modulating/demodulating part 41 are connected in series, but they also can be connected in parallel.
In a single day loop coil 12 receives the carrier wave through the ASK modulation from R/W 30, and rectifier 40 just carries out rectification to carrier wave, produces supply voltage, and the demodulator circuit that is located in the modulating/demodulating part 41 is separated the carrier wave of menstruation regulating rectification, obtains restituted signal.
Here, restituted signal not only contains data, also contains the information that other resembles instruction and address and so on.Control section 42 deposits data in the storage area 43 in according to these information processing restituted signals again.Here, the control of control section 42 is to be carried out according to the clock signal that produces from carrier wave by the clock generating circuit (not shown).
The supply voltage that voltage stabilizing circuit 44 is regulated wave detector 40 generations makes it be no more than certain threshold voltage.This voltage stabilizing circuit 44 is so-called shunt regulator, and its effect is the circuit of protection in the non-contact IC card 10 such as reason overvoltage and damaging not under the situation that becomes too short etc. in the spacing between non-contact IC card 10 and the R/W 30.
Subsequent, the general structure and the working condition of the demodulator circuit in the modulating/demodulating part 41 that is located at non-contact IC card 10 once are described.Fig. 3 is the circuit diagram of an exemplary construction of expression demodulator circuit.
When loop coil 12 was received from R/W 30 through the carrier wave of ASK modulation, its two ends produced voltage, the voltage that is produced after over commutation and envelope detection as supply voltage (to call " V in the following text
Dd") import in the demodulator circuit.Resistor 901 and 902 is coupled to V
DdInput, capacitor 903 and 904 is coupled to the convergence point (to call " node A " in the following text) of resistor 901 and 902.Capacitor 903 is smmothing capacitors, for filtering remaining clutter after rectifier 40 rectifications.
Reference voltage generating circuit also is connected with another input (to call " node C " in the following text) of comparator 908 by resistor 906.Comparator 908 is equipped with a latch, and is configured to when the input voltage of Node B surpasses the input voltage certain value of node C its output (restituted signal) paraphase.More particularly, comparator 908 in two threshold values (with respect to V
RefLast lower threshold value) between have hysteresis characteristic.This specific character can avoid the output of comparator 908 to suffer paraphase when supply voltage slightly changes for some reason at every turn.
Fig. 4 is the time diagram of each node voltage level in the demodulator circuit shown in Figure 3.As shown in FIG., the supply voltage (V that produces of the carrier wave received of loop coil 12 from through ASK modulation
Dd) by resistor 901 and 902 dividing potential drops, produce the voltage that draws at node A.This voltage sends Node B at the differential component of node A.If the voltage of Node B is with respect to the reference voltage (V of node C
Ref) surpassing any one of two threshold values (horizontal dotted line up and down with Node B among the figure is represented), restituted signal is with regard to paraphase.
In non-contact IC card 10, control section 42 and storage area 43 power consumption in the course of the work.Here, non-contact IC card 10 is owing to be to obtain electric energy from radio wave, thereby its source impedance height, and since it is so, the moment power consumption sharply descends supply voltage, and then influence the waveform of supply voltage, and the clutter of initiation shown in arrow A among Fig. 4 or C.On the other hand, this mains voltage waveform also transmits to be needed by demodulation in addition data recovered and accompanying information, thereby if the interference in the mains voltage waveform causes the big clutter that must be enough to above any threshold value of comparator 908, even then data value has virtually no variation between 0 and 1, the output of comparator 908 also can wrong paraphase.When this thing happens, initial data can not correctly be recovered.
For example, the descend clutter cause of A point voltage can cause data 1 as the erroneous judgement of data 0 (from the A point to the B point), and perhaps the rising that causes because of the rebound of ordering at C of voltage can cause data 0 as the erroneous judgement of data 1 (from the C point to the D point).
The objective of the invention is to prevent from the non-contact IC card that receives data from R/W, to recover less than 100% ASK modulation because of the interference in the mains voltage waveform is causing error in data by the index of modulation.
Above-mentioned purpose can reach by a kind of like this non-contact IC card, this non-contact IC card comprises that a demodulator circuit and one delay part, demodulator circuit receives the carrier wave of modulating with numerical data ASK, and separate carrier wave that menstruation regulating ASK modulated to recover numerical data, delay to delay during the data value of part in numerical data can not change the demodulation of demodulator circuit.
Under the situation of this structure, the data value in the data on being carried on carrier wave just postpones carrying out demodulation during can not changing (data 0 become data 1, and data 1 become data 0).By doing like this,, also can avoid error in data to recover even occur clutter in the mains voltage waveform.
Here, demodulator circuit can comprise detecting circuit, CR time constant circuit, reference voltage generating circuit and comparison circuit.The delaying and to be undertaken by following measures of demodulation: between two inputs of comparison circuit, form short circuit; Reduce the output voltage of CR time constant circuit by the time constant that changes the CR time constant circuit; Or the lagging width that passes through the increase comparison circuit reduces the sensitivity of comparison circuit.
Can know above and other objects of the present invention, advantage and the characteristics understood from the explanation of the present invention being carried out below in conjunction with accompanying drawing.Accompanying drawing is for example understood a specific embodiment of the present invention, in the accompanying drawing:
Fig. 1 shows the general structure of contactless IC card system;
Fig. 2 is the block diagram of IC shown in Fig. 1;
Fig. 3 is the circuit diagram that is provided in the structure of the example of demodulator circuit in the modulating/demodulating part of IC shown in Fig. 2;
Fig. 4 is the time diagram of each node voltage level in Fig. 3 demodulator circuit;
Fig. 5 is the circuit diagram that is provided in the structure of the example of demodulator circuit in the non-contact IC card modulating/demodulating part of first embodiment of the invention;
Fig. 6 is the time diagram of each node voltage level in Fig. 5 demodulator circuit, together with the waveform of demodulation delay signal;
Fig. 7 is the circuit diagram that is provided in the structure of the example of demodulator circuit in the second embodiment of the invention non-contact IC card modulating/demodulating part;
Fig. 8 is the circuit diagram that is provided in the structure of the example of comparator in the third embodiment of the invention non-contact IC card modulating/demodulating part;
Fig. 9 is the time diagram of each node voltage level in the 3rd embodiment demodulator circuit, together with the waveform of demodulation delay signal; And
Figure 10 is the circuit diagram of structure of an example of demodulator circuit of a kind of remodeling of the present invention.
Consult the description of drawings some embodiments of the present invention below.
First embodiment
Fig. 5 is the circuit diagram that is assemblied in an exemplary construction of demodulator circuit in the modulating/demodulating part 41 of non-contact IC card 10 of first embodiment of the invention.A kind of difference of shown in this demodulator circuit and Fig. 3 that is, has been equipped with a transistor 107, for two inputs (Node B and C) at preset time short circuit comparator 108, in case the output paraphase of comparator 108.Structural detail except that transistor 107, promptly resistor 101 and 102, capacitor 103 and 104, resistor 105 are all the same with those elements shown in Fig. 3 with comparator 108 with 106, therefore no longer describe in detail here.
More particularly, Node B and node C connect the source electrode and the drain electrode of transistor 107 respectively, the grid of demodulation delay signal input transistors 107.Under the situation of this structure, Node B and node C are in the short circuit state when the conducting of demodulation delay signal, thereby even avoid the output of comparator 108 the also unlikely paraphase of clutter to occur in mains voltage waveform.
This demodulation delay signal produces in the following manner.Fig. 6 is the time diagram of each node voltage level in Fig. 5 demodulator circuit, together with the waveform of demodulation delay signal.
Here contactless IC card system adopts ISO 1443 Type Bs, thereby is loaded with about 212 kilo hertzs data on the 13.56 megahertz carrier waves.Though it is about 10% that the index of modulation is got in the present embodiment, the index of modulation is not limited thereto.In addition, non-contact IC card 10 is equipped with the clock generating circuit (not shown) here, by to the carrier wave frequency division received and the clock signal that produces from clock generating circuit offers control section 42, storage area 43 etc.In this embodiment, 13.56 megahertz carrier waves are removed 4 frequency divisions, thereby produce the clock signal of 3.39 megahertzes, offer the said structure element of non-contact IC card 10.
The signal that transmits from R/W 30 by carrier wave comprises a signal, and (" 010101010 ") and synchronizing signal (for example " 01010011 ") for example, R/W 30 and non-contact IC card 10 are synchronous for making.Adopt these signals, control section 42 detects the time of existing rising edge clock signal or trailing edge and the time (promptly changing the time that next bit takes place over to from a bit) that data value changes (data 0 become data 1, and data 1 become data 0).These detected time has been arranged, and control section 42 just can be determined the time such as the time of reading restituted signal, the time that makes the connection of demodulation delay signal and visit storage area 43.
For example, when receiving synchronously (SYNC) signal, control section 42 usefulness internal counters begin to count out the number of clock edges, and the demodulation delay signal is connected along (for example putting B) along (for example putting A) rising edge afterwards at rising edge, and at this moment data value may change.In view of the demodulation delay signal is in the grid of input transistors 107, thereby Node B and node C short circuit when the demodulation delay signal is connected.Therefore, even clutter occurs in the mains voltage waveform during this period, paraphase is also avoided in the output of comparator 108 (restituted signal).Meanwhile, control section 42 is visited storage area 43 when the demodulation delay signal is connected.In case the visit of storage area 43 is not caused that the risk of clutter, control section 42 just make demodulation delay signal (at for example C point) turn-off, and recover the demodulation that the data that are carried on the carrier wave are carried out.Among Fig. 6, for example, data value may change at A point and/or D point, thereby control section 42 is controlled the demodulation delay signal was turn-offed before these points at least.
By doing like this, even also can avoid data to recover to make mistakes owing to clutter is appearred in the visit of storage area 43 or other reason in mains voltage waveform.
Second embodiment
In first embodiment, the grid that the demodulation delay signal is added to transistor 107 makes Node B and node C short circuit, thereby avoids causing the misdata recovery because of occurring clutter in the mains voltage waveform.On the other hand in a second embodiment, when the demodulation delay signal was connected, the time constant of the differential circuit that is made of capacitor 104 and resistor 105 increased, and also avoided the voltage of Node B to surpass the threshold value of comparator 108 even occur clutter in the mains voltage waveform.
Fig. 7 is the circuit diagram that is provided in an example of demodulator circuit that is equipped with in the non-contact IC card 10 modulating/demodulating parts 41 of second embodiment of the invention.As shown in FIG., capacitor 103 and a new capacitor 109 are connected in parallel, and transistor 107 connects capacitor 109, in the grid of demodulation delay signal input transistors 107.Under the situation of this structure, the time constant of the CR time constant circuit that capacitor 104 and resistor 105 constitute keeps higher level when the demodulation delay signal is connected.
Therefore, even when clutter occurring in mains voltage waveform, the voltage of Node B also can not surpass the threshold value in the comparator 108, thereby can avoid the output paraphase of comparator 108.Here, consider the threshold value of the best optimization comparator 108 of threshold value of comparator 108, make the voltage of B node unlikely above any threshold value when clutter occurs.
The 3rd embodiment
In the 3rd embodiment, and the lagging width of raising comparator 108 when the demodulation delay signal is connected (, make the last lower threshold value of comparator 108 improve and reduce certain value respectively) thus clutter is wrong to be recovered because of occurring in the mains voltage waveform to avoid data.
Fig. 8 is the circuit diagram of 108 1 exemplary construction of comparator in this embodiment demodulator circuit.Comparator 108 comprises P channel MOS transistor (to call " PchMOS transistor " in the following text) 301 to 305 and N-channel MOS transistor (to call " NchMOS transistor " in the following text) 306 to 315, supply voltage (V
Dd) input PchMOS transistor 301,304 and 305 source electrode.
In addition, the bias voltage used of Current Control is added to the grid of PchMOS transistor 301.The level of this bias voltage is not limited especially, but according to V
DdAnd V
RefDetermine.The voltage of Node B is added to the grid of PchMOS transistor 302, the voltage (V of node C
Ref) be added to the grid of PchMOS transistor 303.
In addition, the demodulation delay signal is imported in the grid of NchMOS transistor 308 and 312, thereby makes the last lower threshold value in the comparator 108 keep higher and lower level 1 respectively when the demodulation delay signal is connected, and can avoid error in data to recover.
Fig. 9 is the time diagram of each node voltage level in expression the 3rd embodiment demodulator circuit, together with the waveform of demodulation delay signal.As shown in FIG., even when the input voltage of Node B changes because of clutter appears in (for example at the C point), last lower threshold value in the comparator 108 also is in higher and lower level respectively when connecting (for example from the A point to the B point) in the demodulation delay signal, thereby although exists clutter also can not make the restituted signal paraphase.
Like this, can avoid data to recover by the lagging width that changes comparator 108 because of the clutter in the mains voltage waveform is wrong.
Remodeling
Although with regard to more above-mentioned embodiment the present invention is described above, the present invention is not limited thereto.For example, can carry out following remodeling.
(1) can be with being used in combination that first to the 3rd embodiment changes.
(2) in above-mentioned all embodiment, the present invention is applied to supply voltage (V
Dd) the voltage division signal differential circuit of flowing through and forming by capacitor 104 and resistor 105, and the demodulator circuit of the differentiated waveform input comparator 108 that draws.
Yet the present invention also can be applicable in the demodulator circuit of different structure.Figure 10 shows the situation that the present invention is applied to the structure demodulator circuit different with the foregoing description.This demodulator circuit comprises PchMOS transistor 401 to 403, NchMOS transistor 404 to 406, capacitor 407 and comparator 408.Supply voltage (V
Dd) be added to the source electrode of PchMOS transistor 401, reference voltage (V
Ref) be added to the grid of NchMOS transistor 404 and 405.Here comparator 408 input is referred to as node A, and another input is referred to as Node B.
The operation principle of this demodulator circuit is as follows.Work as V
DdDuring decline, the variation of the Node B place voltage that is connected with capacitor 407 be it seems slower than the variation of node A voltage.In other words, V
DdDuring decline, the voltage of node A keeps a period of time to be lower than the voltage of Node B.When this thing happens, comparator 408 detected V
DdDecline, and make through the signal of demodulation and reduce.Same principle is applicable to V
DdSituation about rising.
Yet, suppose that the power consumption of storage area 43 grades is quite big, the clutter that therefore produces in the mains voltage waveform may the big variation that must be enough to think by mistake data value, thereby error in data is recovered.For avoiding this point, the transistor 406 of having pegged graft between node A and Node B makes the grid of demodulation delay signal input transistors 406, and node A and Node B short circuit are got up.
Though describe the present invention by way of example all sidedly with reference to accompanying drawing above, should be noted that those skilled in the art knows can make many variations and remodeling to the foregoing description.Therefore, this class is only changed and is revised otherwise departs from the scope of the present invention all and should comprise in the present invention.
Claims (14)
1. non-contact IC card is characterized in that it comprises:
A demodulator circuit receives the carrier wave of modulating with numerical data ASK, conciliates the carrier wave that menstruation regulating ASK modulated, to recover numerical data; With
Retarding means delays the demodulation operation of demodulator circuit during the data value of numerical data can not change.
2. non-contact IC card as claimed in claim 1 is characterized in that demodulator circuit comprises:
A detecting circuit, the envelope of the carrier wave that ASK was modulated carries out detection;
A reference voltage generating circuit, output reference voltage;
A differential circuit receives the envelope from detecting circuit, and exports the differential component of the envelope of receiving according to reference voltage; With
A comparison circuit, comprise first input end, second input and an output, first input end is for the output that receives differential circuit, second input is for the output that receives reference voltage generating circuit, described comparison circuit is compared the voltage of first input end and the voltage of second input, and the difference between two voltages when surpassing predetermined value with the output paraphase of output.
3. non-contact IC card as claimed in claim 2 is characterized in that retarding means comprises:
A short-circuit control circuit, during the data value of numerical data can not change with the first input end and the second input short circuit; With
A short circuit control signal output circuit is given short-circuit control circuit output short-circuit control signal, shows the impossible time that changes of data value of numerical data.
4. non-contact IC card as claimed in claim 3 is characterized in that, short-circuit control circuit is a transistor, and this transistorized source electrode and drain electrode connect the different terminals in first and second inputs of comparison circuit, and transistorized grid receives the short circuit control signal.
5. non-contact IC card as claimed in claim 4 is characterized in that, described short circuit control signal output circuit comprises:
A clock generating circuit, clocking;
A counter is counted out the edge number of clock signal; With
Control device is carried out control, makes to assert the short circuit control signal when the count value of counter reaches predetermined number.
6. non-contact IC card as claimed in claim 5 is characterized in that, it also comprises a memory, the numerical data of described memory behind recovery of stomge under the control of control device spare, reference to storage when control device has the short circuit control signal to send in identification.
7. non-contact IC card as claimed in claim 2 is characterized in that, differential circuit is the CR time constant circuit, and retarding means comprises:
A time constant increases circuit, and the time constant with the CR time constant circuit during the data value of numerical data can not change maintains higher level; With
A time constant control signal output circuit increases circuit output time constant control signal to time constant, shows the impossible time that changes of data value of numerical data.
8. non-contact IC card as claimed in claim 7 is characterized in that, time constant increases circuit and comprises:
First capacitor is connected in parallel with second capacitor that is included in the CR time constant circuit; With
A switch element is connected with first capacitors in series, receives the time constant control signal from time constant control signal output circuit.
9. non-contact IC card as claimed in claim 8 is characterized in that, switch element is a transistor, and transistorized source electrode or drain electrode connect first capacitor, transistorized grid time of reception constant control signal.
10. non-contact IC card as claimed in claim 7 is characterized in that, time constant control signal output circuit comprises:
A clock generating circuit, clocking;
A counter is counted out the edge number of clock signal; With
Control device is carried out control, makes to assert the time constant control signal when the count value of counter reaches predetermined number.
11. non-contact IC card as claimed in claim 10, it is characterized in that, it also comprises a memory, the numerical data of described memory recovery of stomge under the control of control device, and control device is the described memory of visit during assert free constant control signal.
12. non-contact IC card as claimed in claim 2 is characterized in that, comparison circuit lags behind between last lower threshold value with respect to reference voltage, and upper threshold value is the summation of predetermined value and reference voltage, and lower threshold value is the difference of predetermined value and reference voltage:
Wherein retarding means comprises:
A hysteresis control signal output circuit is given comparison circuit lag output control signal, shows the impossible time that changes of data value of numerical data; And
Wherein comparison circuit comprises:
A hysteresis control circuit remains on higher level with predetermined value, thereby lagging width is remained on the level of broad during the data value of numerical data can not change
13. non-contact IC card as claimed in claim 12 is characterized in that, hysteresis control signal output circuit comprises:
A clock generating circuit, clocking;
A counter is counted out the edge number of clock signal; With
Control device is carried out control, makes and send the hysteresis control signal when the count value of counter reaches predetermined value.
14. non-contact IC card as claimed in claim 13 is characterized in that, it also comprises a memory, the numerical data of described memory recovery of stomge under the control of control device, and control device is reference to storage during identification has the hysteresis control signal.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26863299A JP3931500B2 (en) | 1999-09-22 | 1999-09-22 | Non-contact IC card and data processing method thereof |
| JP268632/1999 | 1999-09-22 | ||
| JP268632/99 | 1999-09-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1289188A true CN1289188A (en) | 2001-03-28 |
| CN100525135C CN100525135C (en) | 2009-08-05 |
Family
ID=17461254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001304364A Expired - Fee Related CN100525135C (en) | 1999-09-22 | 2000-09-21 | Non-contact type IC card preventing data from error restoring while AM wave-carrier demodulation |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US6907088B1 (en) |
| EP (1) | EP1087333B1 (en) |
| JP (1) | JP3931500B2 (en) |
| KR (1) | KR20010050578A (en) |
| CN (1) | CN100525135C (en) |
| DE (1) | DE60042674D1 (en) |
| HK (1) | HK1036138A1 (en) |
| TW (1) | TW496048B (en) |
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| CN100342386C (en) * | 2001-12-18 | 2007-10-10 | 内部无接触技术公司 | Non-contact integrated circuit reader comprising a low power consumption active standby mode |
| CN1988523B (en) * | 2005-12-21 | 2011-08-17 | 上海华虹集成电路有限责任公司 | Demodulating method and its circuit for amplitude modulation signal |
| CN103872989A (en) * | 2012-12-17 | 2014-06-18 | 上海华虹集成电路有限责任公司 | Amplitude modulation signal demodulating circuit |
| CN104573794A (en) * | 2014-12-23 | 2015-04-29 | 北海市蕴芯电子科技有限公司 | Frequency modulation return circuit for passive radio frequency card |
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| JP2003296683A (en) * | 2002-04-04 | 2003-10-17 | Matsushita Electric Ind Co Ltd | Non-contact ic card |
| JP2005142889A (en) * | 2003-11-07 | 2005-06-02 | Matsushita Electric Ind Co Ltd | Communication method for data carrier |
| US20080252367A1 (en) * | 2007-04-10 | 2008-10-16 | Micrel, Inc. | Demodulator with Multiple Operating Modes for Amplitude Shift Keyed Signals |
| KR100866602B1 (en) * | 2007-05-22 | 2008-11-03 | 삼성전자주식회사 | Ask rf signal decoding device and method thereof |
| DE102007040854A1 (en) * | 2007-08-29 | 2009-03-12 | Texas Instruments Deutschland Gmbh | Transponder demodulator for a low antenna limiter threshold |
| US7971794B2 (en) * | 2008-02-07 | 2011-07-05 | Infineon Technologies Ag | Actively regulated modulation index for contactless IC devices |
| KR101543646B1 (en) * | 2009-03-13 | 2015-08-12 | 삼성전자주식회사 | Apparatus for TYPE-A Demodulation and Integrated Circuit Card having the same |
| EP2282406B1 (en) * | 2009-07-31 | 2016-04-20 | STMicroelectronics Srl | Receiver for signal communications with disturbances rejection |
| US8478332B2 (en) | 2009-07-31 | 2013-07-02 | Stmicroelectronics, S.R.L. | Receiver for signal communication system with disturbance rejection circuit |
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- 1999-09-22 JP JP26863299A patent/JP3931500B2/en not_active Expired - Fee Related
-
2000
- 2000-09-19 US US09/665,133 patent/US6907088B1/en not_active Expired - Fee Related
- 2000-09-20 EP EP00308205A patent/EP1087333B1/en not_active Expired - Lifetime
- 2000-09-20 DE DE60042674T patent/DE60042674D1/en not_active Expired - Lifetime
- 2000-09-21 TW TW089119509A patent/TW496048B/en not_active IP Right Cessation
- 2000-09-21 CN CNB001304364A patent/CN100525135C/en not_active Expired - Fee Related
- 2000-09-22 KR KR1020000055666A patent/KR20010050578A/en not_active Application Discontinuation
-
2001
- 2001-07-17 HK HK01105005.1A patent/HK1036138A1/en not_active IP Right Cessation
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100342386C (en) * | 2001-12-18 | 2007-10-10 | 内部无接触技术公司 | Non-contact integrated circuit reader comprising a low power consumption active standby mode |
| CN1988523B (en) * | 2005-12-21 | 2011-08-17 | 上海华虹集成电路有限责任公司 | Demodulating method and its circuit for amplitude modulation signal |
| CN103872989A (en) * | 2012-12-17 | 2014-06-18 | 上海华虹集成电路有限责任公司 | Amplitude modulation signal demodulating circuit |
| CN103872989B (en) * | 2012-12-17 | 2018-02-13 | 上海华虹集成电路有限责任公司 | Am signals demodulator circuit |
| CN104573794A (en) * | 2014-12-23 | 2015-04-29 | 北海市蕴芯电子科技有限公司 | Frequency modulation return circuit for passive radio frequency card |
| CN104573794B (en) * | 2014-12-23 | 2017-07-28 | 宁波远志立方能源科技有限公司 | A kind of frequency modulation(PFM) return circuit for passive RF card |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100525135C (en) | 2009-08-05 |
| JP3931500B2 (en) | 2007-06-13 |
| EP1087333A3 (en) | 2002-09-04 |
| EP1087333A2 (en) | 2001-03-28 |
| US6907088B1 (en) | 2005-06-14 |
| TW496048B (en) | 2002-07-21 |
| JP2001092938A (en) | 2001-04-06 |
| DE60042674D1 (en) | 2009-09-17 |
| EP1087333B1 (en) | 2009-08-05 |
| HK1036138A1 (en) | 2001-12-21 |
| KR20010050578A (en) | 2001-06-15 |
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